Swamped

A key. No - a copy of one, made from clay. Not obviously useful, but Reth's not one to go to all this trouble for frivolities.

Wait. There's a scent on it - a grebling scent. She's giving you a trail to follow.

It's not particularly easy - the grebling doesn't seem to have actually come this way. You're essentially tracing the key's path rather than that of its owner. But it's enough to lead you through the machinery. You come to a ladder, and start climbing.

There's a closed door not far off. You open it, as quietly as possible, and look inside.

An unconscious grebling priest. And one of the lizards you met earlier today is laid down next to him. Looks like there's a sleeping enchantment on them.

Reth guided you here. Now what are you to do?